Also you're not female. Have a feminine name in a male-dominated environment adds to suspicion (is that a guy masquerading as girl?) and (mostly harmless and unintended) gender-bias comments or, what I feel is even worse, special attention.

The larger reason I don't post publicly with my real name is that, quite frankly, what I have to say in public needs to be in context. If you google my name and it comes up with a bunch of comments, and you don't take the time to read the context then it's very, very easy to come to a false conclusion of a person's beliefs.

Disclaimer: I use my real name in g+ but I don't post publicly and disable my posts to be shared. I'm no dissident but I value my searchable-privacy and so do my friends. I post more in g+ than I ever did in Facebook because of the circles feature.

Last quick note: I've had seemingly innocuous content that was searchable on my name used against me, a long time ago. I've since taken great care to remain anonymous and have found that my use of public forums is far more free and enjoyable and I have no issues at all speaking with others whose names I do not know (HN as a case).